asp:TreeView UpdatePanel学习笔记

程序员文章站 2022-03-04 11:49:20

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TreeVew控件由Treenode(节点)构成，一个节点主要是将数据存储在两个属性，Text属性和 value属性。值 Text 属性显示在 TreeView 控件，Value 属性用来存储节点的其他数据，如用于处理回发事件的相关数据。TreeView控件中的节点有两种模式：选择模式和导航模式。默认处于选择模式，若要使其处于导航模式，将NavigateUrl设置为与节点相关联的页面。若设置为空，则处于选择模式。Target属性设置目标内容或框架，用于显示与节点相关联的内容。NavigateUrl设置单击节点时要导航到的页面。

当节点的属性PopulateOnDemand设置为trues时，在该节点展开运行时动态填充该节点，动态填充节点时调用OnTreeNodePopulate事件方法引发TreeNodePopulate事件进行填充。

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<frameset name="total" rows="*" cols="*" border=0 framespacing=0 frameborder="no" bordercolor="#3366cc">
    <frameset cols="200,*" name=ecc frameborder="no" bordercolor="#3366cc">
        <frame src="tree1.aspx" name="leftFrame" scrolling="no" frameborder="no" id="leftFrame" title="leftFrame" />
        <frame src="tabContent.aspx" name="mainFrame" id="mainFrame" frameborder="no" title="mainFrame" scrolling="no" />
    </frameset>
</frameset>
<noframes>
    <body>
    </body>
</noframes>
</html>

home.HTML

<body>
    <form id="form1" runat="server">
    <div>
        <asp:TreeView ID="treeviewTest1" ForeColor="Black" ShowLines="true" ExpandDepth="0" runat="server" 
            OnTreeNodePopulate="treeviewTest1_TreeNodePopulate" >
            <Nodes>
                <asp:TreeNode Text="ROOT" SelectAction="Expand" PopulateOnDemand="true" Value="0" NavigateUrl="~/tabContent.aspx?uid=0" Target="mainFrame"/>

            </Nodes>
        </asp:TreeView> 
    </div>
    </form>
</body>

tree1.aspx

 public partial class tree1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        //动态填充节点事件
        protected void treeviewTest1_TreeNodePopulate(object sender, TreeNodeEventArgs e)
        {
            firstLevelAdd(e.Node);
        }

        //填充节点
        private void firstLevelAdd(TreeNode treeNode)
        {
            DataSet dtset = Runquery("select OBJECTID,OBJECTVALUE from objectTable where OBJECTPARENTID=" + treeNode.Value);
            if (dtset.Tables.Count>0)
            {
                foreach (DataRow row in dtset.Tables[0].Rows)
                {
                    string uid = row["OBJECTID"].ToString();
                    TreeNode newtreenode = new TreeNode(row["OBJECTVALUE"].ToString(), row["OBJECTID"].ToString());
                    newtreenode.PopulateOnDemand = true;
                    //newtreenode.SelectAction = TreeNodeSelectAction.Expand;
                    newtreenode.Target = "mainFrame";
                    newtreenode.NavigateUrl = "tabContent.aspx?uid=" + System.Web.HttpUtility.UrlEncode(uid);
                    treeNode.ChildNodes.Add(newtreenode);
                }
            }
        }

        //查询节点信息
        private DataSet Runquery(string querystr)
        {
            string connstr = "Data Source=HEX208;Initial Catalog=treeviewTest;Integrated Security=True";
            SqlConnection sqlconn = new SqlConnection(connstr);
            sqlconn.Open();
            SqlDataAdapter sqldap;
            DataSet dtset=new DataSet();
            try
            {
                sqldap = new SqlDataAdapter(querystr, sqlconn);
                sqldap.Fill(dtset);
                sqlconn.Close();
            }
            catch (Exception ex)
            {
                if(sqlconn.State==ConnectionState.Open)
                {
                    sqlconn.Close();
                }
                Console.WriteLine(ex.Message);
            }
            return dtset;

        }

    }

tree1.aspx.cs

UpdatePanel控件是局部更新控件，一般与asp:ScriptManager结合使用。包含了ContenTemplate与Triggers两部分。Triggers为触发器（局部跟新触发器），Triggers为空时，UpdatePanel内部控件触发局部更新。Triggers设置AsynPostedBackTrigger时，内/外部控件触发局部控件。Triggers设置PostedBackTrigger时，内/外部控件触发全局更新。

<form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <div>
            <table>
                <tr>
                    <td>
                        <asp:Button id="bt1" runat="server" OnClick="bt1_Click" Text="TSTbt1"/>
                    </td>
                    <td>
                        <asp:TextBox ID="tstTxt2" runat="server"></asp:TextBox>
                    </td>
                </tr>
            </table>
            <asp:UpdatePanel runat="server" ID="updatePanel1">
                <ContentTemplate>
                    <asp:GridView id="tstGView" runat="server" Width="98%" OnSelectedIndexChanged="tstGView_SelectedIndexChanged">
                        <Columns>
                            <asp:TemplateField>
                                <HeaderTemplate>
                                    <asp:CheckBox runat="server" id="cbAll" Text="select" OnCheckedChanged="cbAll_CheckedChanged"/>
                                </HeaderTemplate>
                                <ItemTemplate>
                                    <asp:CheckBox ID="cbSingle" runat="server" Text="select" OnCheckedChanged="cbSingle_CheckedChanged" />
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:TemplateField>
                                <HeaderTemplate>Edit</HeaderTemplate>
                                <ItemTemplate>
                                    <asp:LinkButton runat="server" ID="edit" Text="edit" ></asp:LinkButton>
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Columns>
                    </asp:GridView>
                    <asp:TextBox ID="tstTxt1" runat="server"></asp:TextBox>
                    <asp:Button ID="bt2" runat="server" OnClick="bt2_Click" Text="TSTbt2"/>
                </ContentTemplate>
                <Triggers>
                    <%--<asp:AsyncPostBackTrigger  ControlID="bt2" EventName="Click"/>
                    <asp:PostBackTrigger ControlID="bt1"/>--%>
                </Triggers>
            </asp:UpdatePanel>
        </div>
    </form>

tabContent.aspx

protected void Page_Load(object sender, EventArgs e)
        {
            initDataBind();
            this.tstTxt1.Text = DateTime.Now.ToString();
            this.tstTxt2.Text = DateTime.Now.ToString();
        }

        
        private void initDataBind()
        {
            string str = "select * from objectTable where OBJECTPARENTID="+getuid();
            DataSet ds=query(str);
            if(ds.Tables[0]!=null)
            {
                DataTable dt=new DataTable();
                DataColumn dc = new DataColumn("Object ID", typeof(string));
                dt.Columns.Add(dc);
                dc = new DataColumn("Object Name", typeof(string));
                dt.Columns.Add(dc);
                dc = new DataColumn("Parent ID", typeof(string));
                dt.Columns.Add(dc);
                foreach (DataRow row in ds.Tables[0].Rows)
                {
                    DataRow dr = dt.NewRow();
                    dr[0] = row["OBJECTID"].ToString();
                    dr[1] = row["OBJECTVALUE"].ToString();
                    dr[2] = row["OBJECTPARENTID"].ToString();
                    dt.Rows.Add(dr);
                }
                this.tstGView.DataSource = dt;
                this.tstGView.DataBind();
            }
        }

        private DataSet query(string str)
        {
            string connstr = "Data Source=HEX208;Initial Catalog=treeviewTest;Integrated Security=True";
            SqlConnection sqlconn = new SqlConnection(connstr);
            sqlconn.Open();
            SqlDataAdapter sqldap;
            DataSet dtset = new DataSet();
            try
            {
                sqldap = new SqlDataAdapter(str, sqlconn);
                sqldap.Fill(dtset);
                sqlconn.Close();
            }
            catch (Exception ex)
            {
                if (sqlconn.State == ConnectionState.Open)
                {
                    sqlconn.Close();
                }
                Console.WriteLine(ex.Message);
            }
            return dtset;
        }
        private string getuid()
        {
            string uid = "0";
            try
            {
                string uidquery = Request.QueryString["uid"].ToString();
                if (uidquery != null)
                {
                    uid = uidquery;
                }
            }
            catch
            {
            }
            return uid;
        }

tabContent.aspx.cs

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